What is circuit breaker PDF?
circuit breaker) high pressure air is forced on the arc through a nozzle at the instant of contact separation. The ionized medium between the contacts is blown away by the blast of the air. After the arc extinction the chamber is filled with high pressure air, which prevents restrike.
What is circuit breaker Slideshare?
SF6 CIRCUIT BREAKERS It contains an arc interruption chamber containing SF6 gas. In closed position the contacts remain surrounded by SF6 gas at a pressure of 2.8 kg/cm2 . During opening high pressure SF6 gas at 14 kg/cm2 from its reservoir flows towards the chamber by valve mechanism.
What is CKT breaker?
An air Circuit Breaker (ACB) is an electrical device used to provide Overcurrent and short-circuit protection for electric circuits over 800 Amps to 10K Amps. There are several types of Air circuit breakers and switching gears available in the market today that is durable, high-performing, easy to install and maintain.
What is the function of SF6 circuit breaker?
Instead of oil, air, or a vacuum, a sulfur hexafluoride circuit breaker uses sulfur hexafluoride (SF6) gas to cool and quench the arc on opening a circuit. Advantages over other media include lower operating noise and no emission of hot gases, and relatively low maintenance.
Why circuit breakers are used?
A circuit breaker is a safety device to prevent damage to motors and wiring when the current flowing through the electrical circuit supersedes its design limits. It does this by removing the current from a circuit when an unsafe condition arises.
What is the name of circuit breaker?
There are three basic circuit breaker varieties: standard breakers (which include both single-pole and double-pole circuit breakers), ground fault circuit interrupter circuit breakers (GFCIs) and arc fault circuit interrupter circuit breakers (AFCIs).
What is Relay PPT?
3. INTRODUCTION • A relay is an electrically operated switch. Relays are used where it is necessary to control a circuit by a low-power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal.
What are the applications of circuit breaker?
The circuit breaker is a switching device which also offers protection by tripping & cutting off the supply to load in case of fault. Primarily the circuit breakers are used for switching of different kinds of load in Industries, Buildings, Commercial Complexes, and Hotels, etc.
How many CKT breakers are there?
The three main types of circuit breakers are standard, GFCI and AFCI. Some models have dual functionality. Each handles different amp capacities and operates in different locations in the home.
Where is VCB used?
Medium Voltage applications
Vacuum Circuit Breaker or VCB is used for Medium Voltage applications. In VCB the contacts operation & arc quenching takes place inside bottles where Vacuum is present.
What is CB electrical?
A circuit breaker is an electrical safety device designed to protect an electrical circuit from damage caused by an overcurrent or short circuit. Its basic function is to interrupt current flow to protect equipment and to prevent the risk of fire.
What is hexafluoride?
: a fluoride containing six atoms of fluorine in the molecule.